Horast

Special Attacks: 20% chance of double stroke with the tail
It's like a lottery where the Dungeon Master wins player corpses!

It is "Somewhat mammalian" and has steel-grey thick stiff fur, that blends very well in your "average stone-made dungeon" but is valueless, because for some reason, it's immune to being skinned. Those crafty DM's.Dragon Magazine #27 page 41

I remember a long time ago there was a swirly thing like you posted. Only we were to look at it for a bit, then look directly at our hands, and our hands would seem like they were getting bigger and smaller. Optical illusion. Very fun.